Goodwill and Other Intangible Assets - Summary of Other Intangible Assets (Detail) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Finite Lived Intangible Assets [Line Items]
Cost	$ 27,496	$ 34,334
Accumulated Amortization	27,496	34,190
Net Book Value	0	144
Customer Contracts And Relationships
Finite Lived Intangible Assets [Line Items]
Cost	16,880	16,880
Accumulated Amortization	16,880	16,880
Net Book Value	0	0
Patents And Technology
Finite Lived Intangible Assets [Line Items]
Cost	9,644	10,114
Accumulated Amortization	9,644	10,003
Net Book Value	0	111
Trademarks and Trade Names
Finite Lived Intangible Assets [Line Items]
Cost	972	4,834
Accumulated Amortization	972	4,801
Net Book Value	0	33
Other Intangible Assets
Finite Lived Intangible Assets [Line Items]
Cost	0	2,506
Accumulated Amortization	0	2,506
Net Book Value	$ 0	$ 0